1 files changed, 0 insertions, 156 deletions
diff --git a/library/src/math/root.rs b/library/src/math/root.rs
deleted file mode 100644
index d1c5f46a..00000000
--- a/library/src/math/root.rs
+++ /dev/null
@@ -1,156 +0,0 @@
-use super::*;
-
-/// A square root.
-///
-/// ## Example { #example }
-/// ```example
-/// $ sqrt(x^2) = x = sqrt(x)^2 $
-/// ```
-///
-/// Display: Square Root
-/// Category: math
-#[func]
-pub fn sqrt(
-    /// The expression to take the square root of.
-    radicand: Content,
-) -> Content {
-    RootElem::new(radicand).pack()
-}
-
-/// A general root.
-///
-/// ## Example { #example }
-/// ```example
-/// $ root(3, x) $
-/// ```
-///
-/// Display: Root
-/// Category: math
-#[element(LayoutMath)]
-pub struct RootElem {
-    /// Which root of the radicand to take.
-    #[positional]
-    pub index: Option<Content>,
-
-    /// The expression to take the root of.
-    #[required]
-    pub radicand: Content,
-}
-
-impl LayoutMath for RootElem {
-    #[tracing::instrument(skip(ctx))]
-    fn layout_math(&self, ctx: &mut MathContext) -> SourceResult<()> {
-        layout(ctx, self.index(ctx.styles()).as_ref(), &self.radicand(), self.span())
-    }
-}
-
-/// Layout a root.
-///
-/// https://www.w3.org/TR/mathml-core/#radicals-msqrt-mroot
-fn layout(
-    ctx: &mut MathContext,
-    mut index: Option<&Content>,
-    radicand: &Content,
-    span: Span,
-) -> SourceResult<()> {
-    let gap = scaled!(
-        ctx,
-        text: radical_vertical_gap,
-        display: radical_display_style_vertical_gap,
-    );
-    let thickness = scaled!(ctx, radical_rule_thickness);
-    let extra_ascender = scaled!(ctx, radical_extra_ascender);
-    let kern_before = scaled!(ctx, radical_kern_before_degree);
-    let kern_after = scaled!(ctx, radical_kern_after_degree);
-    let raise_factor = percent!(ctx, radical_degree_bottom_raise_percent);
-
-    // Layout radicand.
-    ctx.style(ctx.style.with_cramped(true));
-    let radicand = ctx.layout_frame(radicand)?;
-    ctx.unstyle();
-
-    // Layout root symbol.
-    let target = radicand.height() + thickness + gap;
-    let sqrt = precomposed(ctx, index, target)
-        .map(|frame| {
-            index = None;
-            frame
-        })
-        .unwrap_or_else(|| {
-            let glyph = GlyphFragment::new(ctx, '√', span);
-            glyph.stretch_vertical(ctx, target, Abs::zero()).frame
-        });
-
-    // Layout the index.
-    // Script-script style looks too small, we use Script style instead.
-    ctx.style(ctx.style.with_size(MathSize::Script));
-    let index = index.map(|elem| ctx.layout_frame(elem)).transpose()?;
-    ctx.unstyle();
-
-    let gap = gap.max((sqrt.height() - radicand.height() - thickness) / 2.0);
-    let descent = radicand.descent() + gap;
-    let inner_ascent = extra_ascender + thickness + gap + radicand.ascent();
-
-    let mut sqrt_offset = Abs::zero();
-    let mut shift_up = Abs::zero();
-    let mut ascent = inner_ascent;
-
-    if let Some(index) = &index {
-        sqrt_offset = kern_before + index.width() + kern_after;
-        shift_up = raise_factor * sqrt.height() - descent + index.descent();
-        ascent.set_max(shift_up + index.ascent());
-    }
-
-    let radicant_offset = sqrt_offset + sqrt.width();
-    let width = radicant_offset + radicand.width();
-    let size = Size::new(width, ascent + descent);
-
-    let sqrt_pos = Point::new(sqrt_offset, ascent - inner_ascent);
-    let line_pos = Point::new(radicant_offset, ascent - inner_ascent + thickness / 2.0);
-    let radicand_pos = Point::new(radicant_offset, ascent - radicand.ascent());
-
-    let mut frame = Frame::new(size);
-    frame.set_baseline(ascent);
-
-    if let Some(index) = index {
-        let index_pos = Point::new(kern_before, ascent - shift_up - index.ascent());
-        frame.push_frame(index_pos, index);
-    }
-
-    frame.push_frame(sqrt_pos, sqrt);
-    frame.push(
-        line_pos,
-        FrameItem::Shape(
-            Geometry::Line(Point::with_x(radicand.width())).stroked(Stroke {
-                paint: TextElem::fill_in(ctx.styles()),
-                thickness,
-                ..Stroke::default()
-            }),
-            span,
-        ),
-    );
-
-    frame.push_frame(radicand_pos, radicand);
-    ctx.push(FrameFragment::new(ctx, frame));
-
-    Ok(())
-}
-
-/// Select a precomposed radical, if the font has it.
-fn precomposed(ctx: &MathContext, index: Option<&Content>, target: Abs) -> Option<Frame> {
-    let elem = index?.to::<TextElem>()?;
-    let c = match elem.text().as_str() {
-        "3" => '∛',
-        "4" => '∜',
-        _ => return None,
-    };
-
-    ctx.ttf.glyph_index(c)?;
-    let glyph = GlyphFragment::new(ctx, c, elem.span());
-    let variant = glyph.stretch_vertical(ctx, target, Abs::zero()).frame;
-    if variant.height() < target {
-        return None;
-    }
-
-    Some(variant)
-}